Accident Bell 47G N61SD, Saturday 10 August 1991

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Date:	Saturday 10 August 1991
Time:	20:05 LT
Type:	Bell 47G
Owner/operator:	Central Wisconsin Helicopters
Registration:	N61SD
MSN:	3551
Year of manufacture:	1966
Total airframe hrs:	9065 hours
Engine model:	Lycoming VO-435-AIF
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Lake Ozark, MO - United States of America
Phase:	Initial climb
Nature:	Executive
Departure airport:	Bagnell Dam, MO
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PILOT SAID THAT SHORTLY AFTER TAKEOFF HE HEARD A LOUD SNAP, FOLLOWED BY AN UNCOMMANDED RIGHT YAW. AN EMERGENCY AUTOROTATION WAS EXECUTED WHICH RESULTED IN A HARD WATER LANDING. POST ACCIDENT INVESTIGATION REVEALED THE CHROMEMOLY TUBING HAD FAILED IN FRONT OF THE TAIL ROTOR YOKE, IN FLIGHT.

Probable Cause: FAILURE OF THE ROTORCRAFT'S TAIL BOOM IN FLIGHT. FACTORS RELATED TO THE ACCIDENT WERE REDUCED AIRCRAFT CONTROL AVAILABLE TO THE PILOT.

Accident investigation: